Firstly; breathe. Take a step back and stop doing things. Secondly, your pH should be closer to 6.5, and if it were me, despite the averages, I'd be sure I was floating in that area (pH 6.5). Thirdly, you took these plants from synthetic feed, to flushing and no feed, to new organic feed (top dressed)...all in the course of a few weeks. Your plants don't know if they're coming or going. Fourth, yes, even though your organic amendments may not be available to your plants right away, the addition of them into your soil will surely alter pH in a much shorter time.
So you've committed to the organic / dry amendment route, so let's stick to it...no, don't consider quitting this run. You won't learn diddly do otherwise. If this were my grow, I'd foliar spray some Epsom salt...it will help your plants with their Mg issues while not muddying up your soil any more than it's been. You should see results in a week or so, depending on your plants. I would manage your pH a bit more closely and I'd refrain from doing anything else...no flush, no new amendments, no fancy this or that. Commit to your cause (growing in soil) and take as many notes as you can so you don't run down this rabbit hole again. Be patient...